How to address thread-safety of service data used for maintaining static local variables in C++?

Question

Consider the following scenario. We have a C++ function with a static local variable:

void function()
{
    static int variable = obtain();
    //blahblablah         


        

Answer 1

To avoid the locking in any case, you can go with this:

void functionThreadSafe()
{
    static int *variable = 0;
    if (variable == 0)
    {
       CriticalSectionLockClass lock( criticalSection );
       // Double check for initialization in different thread
       if (variable == 0)
       {
          variable = new int(obtain());
       }
    }
    //blahblablah
}